Sahih Bukhari 245

Narrated Ibn 'Umar: The Prophet (saws) said, I dreamt that I was cleaning my teeth with a Siwak and two persons came to me. One of them was older than the other and I gave the Siwak to the younger. I was told that I should give it to the older..

Narrated Al-Bara 'bin `Azib: The Prophet said to me, Whenever you go to bed perform ablution like that for the prayer, lie or your right side and say, Allahumma aslamtu wajhi ilaika, wa fauwadtu `Amri ilaika, wa alja'tu Zahri ilaika raghbatan..